Thursday 8 October 2026 · Edition of the day

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The Skeptic's Daily

The day's biggest stories, taken apart. For each one: what is actually established, what is only asserted, the questions worth asking — and a plausibility score for the central claim, given everything currently known.

Stories
1
Average plausibility
62%
How to read the score
It rates how well the core claim is evidenced — not how important the story is, nor whether it is good or bad news.
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TopicAllPoliticsConflict & SecurityBusinessScienceHealth
01ScienceSouth America

Bolivian and Tanzanian microbiomes inform human migration research

A study described by NPR suggests that gut microbes travelled with migrating human populations.

NPR describes research comparing gut microbiomes among hunter-gatherers in Tanzania and horticulturalists in Bolivia. The study reports similarities and suggests that gut microbes followed humans across continents. The excerpt raises, but does not answer, questions about these bacteria's role in health.

What holds up

  • ✓The summary identifies the two populations being compared.
  • ✓NPR presents the migration explanation as a study suggestion rather than a proven mechanism.

What doesn't yet

  • ?Sample sizes, methods and the underlying study are not supplied.
  • ?Microbiome similarities alone do not establish the migration explanation within this excerpt, and no health benefit is demonstrated.

Ask before you share

  • →How did researchers distinguish migration history from diet or other shared influences?
  • →How representative were the samples from Bolivia and Tanzania?

Sources & original reporting

  1. [1]NPR · Published 7 Oct 2026 · npr.org